Did a skim of the main website and the top newbie guides but didn't see the answers to some of these other questions I had.  If anyone can help answer them, that would be great. 
 
Question #1: The PvP: Is it like World of Warcraft where, if you're in a level 20-30 zone, a player of the opposite faction can come in with a bunch of friends and have a gank fest? Warhammer had a mechanic where higher brackets can't pvp in lower tier zones. Level 40's couldn't go to the level 20 RvR zone and gank away. Does Aion have something similar? 
 
Question #2: Does the holy trinity still exist? (Holy Trinity= Tank, DPS, Healer) From what I've seen on videos, it seems you don't need the holy trinity to do every day regular quests. However, what about dungeons and bigger encounters? Am I gonna have to stand around for a half hour trying to get someone of a specific class to join my group so we can start playing the content? 
 
Question #3: Is there a mentor (like EQ2) or side kick system (like City of Heroes)? Something to help friends with different play times. Y'know, one guy is level 34, the other guy is level 21.  One guy can lower himself to 21 or bump his friend to 34. With most MMOs, buddies with different life schedules can't play together until you're both max level. This for me happens with every MMO. Like 5-6 friends of mine all get the game at the same time, then we can't play together until like 10 months later when we're all max level. Usually along the way, 4 friends stop playing entirely. 
 
Question #4: If I do join Aion and play, is their an over-powered class.? Every MMO has one. I used to not care. Y'know, the old mantra "play whatever you feel is fun". Yeah well, I always ended up with the gimp class. Murphy's Law laughing at me. If I play this game, I'm thinking about selling out and joining the masses and rolling a class that everyone thinks is the most powerful. That sounds horrible doesn't it?  I know, I know... but I'm just tired of the playing the one class that's gimpy.
 
Question #5: Are there no dungeons to go to in each level bracket?  I've heard of the dungeons in the Abyss area for the higher levels, but none in the lower areas? That would be disappointing. 

Good questions i can kinda help with on. # 2 if you look at some of the higher classes there are classes like Templar that has a lot of defense. Clerics witch can heal and rangers and assassins.

Question #1 (PvP gankage):

Question #2 (Holy Trinity):

Question #3 (Mentor/Sidekick):

Question #4 (Gimp/OP/FoTM classes):

Question #5 (PvE Dungeons/Raiding/Dead Mines):

Thanks Darniaq!  I'm a bit disappointed that this game still has some of the same old things I dislike in MMO games.  
 
First Disappointment: a level based system where your character hits harder with bigger numbers with each level and then allowing these guys to have free access to lower level characters. I don't like what my friends and I call sheep/wolf gameplay. Basically, you play as sheep until you reach max. level. Then you finally get to play as a wolf and the next generation of leveling characters is the sheep for you. 
 
Second Disappointment: Also, no mentor/side kick equalizer for friends with big level gaps? Hmmm....another big minus.   
 
Third possible Disappointment: lack of dungeons in each leveling bracket?
  
This is all unfortunate. The game has some cool animations, some fantastic music, and beautiful landscapes to explore.  I was very close to impulse buying. However, I wanted to do research first. 

The level disparity doesn't appear to be as much an impact as WoW or WAR. But that's mostly from reports rather than first-hand experience. Either I find out my group of mid-20s gets rolled by a single level 35 player, or Borderlands launches and it's all a moot point anyway :)
 
Otherwise, I agree. Aion has some of the old style thinking Western MMOs have long since patched or rethought. The mentor/sidekick thing is still relatively new to the genre (enough so that only one game had it before EQ2, and WoW still doesn't), but the openness of PvP and the lack of WoW-style bracketed dungeons really shows the Eastern influence of the game. "Raiding" over in South Korea, Japan, Taiwan and China is a very different form than the whack-a-mole slot machine of the West :)